Precision measurements of crystals of the alkali halides
Precision measurements of crystals of the alkali halides
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DOI：
10.1103/physrev.21.143
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发表时间：
1923-02-01
期刊：
影响因子：
--
通讯作者：
Davey, WP
中科院分区：
文献类型：
--
作者：
Davey, WP
所有碱卤化物的晶体结构和尺寸。-采用船体粉末法获得x射线衍射图。通过比较每个衍射模式直接与氯化钠的模式同时记录在电影的另一半,每个晶体粉末的光栅空间测量的单位立方体的氯化钠,假定为2.814,精度约0.1%。平均结果的单位立方体如下:离子的安排很简单立方除了RbF,中海,CsBr和CsI是体心立方。对于每个卤化物，从不同平面反射的线的相对强度和相应的计算出的面间距离被制成表格。观察到Cs和I离子的衍射能力与Mo、Ta和W原子的衍射能力相同，而Mo、Ta和W原子的结晶结构与CsI相同，K和Cl离子的衍射能力也相同。
Crystal structure and dimensions for all the alkali halides.—The Hull powder method of obtaining x-ray diffraction patterns was used. By comparing each diffraction pattern directly with the pattern of NaCl simultaneously recorded on the other half of the film, the grating space of each crystal powder was measured in terms of the side of the unit cube of NaCl, assumed to be 2.814 A, with a precision of about 0.1 per cent. The average results for the sides of the unit cubes are as follows: The arrangement of the ions is simple cubic except for RbF, CsCl, CsBr and CsI for which it is body-centered cubic. The relative intensities of the lines reflected from various planes and the corresponding computed interplanar distances are tabulated for each halide. It was observed that Cs and I ions are as equal in diffracting power as are the atoms of Mo, Ta and W, which crystallize with the same structure as CsI, and that K and Cl ions also have equal diffracting power.